铋在双旋浮铜冶炼过程中的分布及回收

介绍铋在双旋浮铜冶炼过程中火法工序、电解工序和稀贵工序中的分布。结果表明,双旋浮铜冶炼工艺中铋最终主要流入铅铋阳极泥中,其次进入炉渣、黑铜板/粉中。同时针对铋富集于铅铋阳极泥中的情况,详细介绍了从铅铋阳极泥中回收铋的工艺过程。     

异海松酸UV固化反应条件研究

研究了异海松酸为单体进行紫外光固化反应的影响因素,采用红外光谱法对双键转化率进行了表征和分析。采用凝胶色谱分析（GPC）、差示扫描量热分析（DSC）和热重分析（TO）等手段对固化膜的性能进行了表征。结果表明：固化过程中双键转化率随光照时间的增加而增加,随引发剂添加量增加先上升后下降;相对固化速率随引发剂用量、光照强度的增加及光照距离的减小而增加。     

Techniques for quickly changing fuel gas in continuous annealing furnaces

An increasing number of annealing furnaces have recently been using cheaper and cleaner natural gas(NG)instead of liquefied petroleum gas(LPG)as fuel gas.However,the fuel gas of the furnaces often needs to be changed when NG supply is not adequate or when LPG becomes cheaper.Usually,changing the fuel gas involves changing various equipment as well as control parameters for instruments and the control system and hence is time consuming.Therefore,it is important to develop aquick process for changing fuel gas.This study discusses the techniques for quickly changing fuel gas in an annealing furnace.These techniques deal with the design of the pipe, valve and burner,the selection of the flow meter and the flow control valve,the switch of the software and parameters for the control system,as well as the operation,commissioning and hot test of the furnace when the fuel gas is changed.Using these techniques,it is possible to change fuel gas in6 h.     

冶金工厂钢筋混凝土圆筒双格料仓的结构设计

通过用力学方法对冶金工厂钢筋混凝土双格圆筒料仓在不同储料载荷情况下的内力分析,提出了双格圆筒料仓壁简化计算方法,给出了荷载变位计算公式.     

二通插装阀在双车翻车机液压系统上的应用

双（多）车翻车机液压系统是目前插装阀工业应用较为集中的系统。以此为平台，介绍二通插装阀的结构组成、工作原理和技术应用情况。     

差分输入双积分电路在热电阻测温中的应用

针对常规分立双积分AD只能处理单端信号的问题,给出了一种输入和基准电压均支持差分信号的分立差分双积分AD;在热电阻测量中,把热电阻和基准电阻串联同一回路,以基准电阻压降作为基准,对热电阻的压降进行测量,并从软硬件两个方面对常见的误差因素进行对消处理;实验表明,该电路用于PT100测温时,跳字不超过0.1℃,精度可以达到±0.1℃,且对运放型号无特殊要求,是一种低成本、高精度的温度测量方案.     

Enhancement of optical emission generated from femtosecond double-pulse laser-induced glass plasma at different sample temperatures in air

In double-pulse laser-induced breakdown spectroscopy(DP-LIBS), the collinear femtosecond double-pulse laser configuration is experimentally investigated with different initial sample temperatures using a Ti:sapphire laser. The glass sample is ablated to produce the plasma spectroscopy. During the experiment, the detected spectral lines include two Na(I) lines(589.0 nm and 589.6 nm) and one Ca(I) line at the wavelength of 585.7 nm. The emission lines are measured at room temperature(22 ℃) and three higher initial sample temperatures(T_s?=?100 ℃, 200 ℃, and 250 ℃). The inter-pulse delay time ranges from-250 ps to 250 ps.The inter-pulse delay time and the sample temperature strongly influence the spectral intensity,and the spectral intensity can be significantly enhanced by increasing the sample temperature and selecting the optimized inter-pulse time. For the same inter-pulse time of 0 ps(single-pulse LIBS), the enhancement ratio is approximately 2.5 at T_s?=?200 ℃ compared with that obtained at T_s?=?22 ℃. For the same inter-pulse time of 150 ps, the enhancement ratio can be up to 4 at T_s?=?200 ℃ compared with that obtained at T_s?=?22 ℃. The combined enhancement effects of the different initial sample temperatures and the double-pulse configuration in femtosecond LIBS are much stronger than that of the different initial sample temperatures or the double-pulse configuration only.     

辊型在线超声检测的研究

在轧制工业中,及时了解轧辊表面磨损情况能有效的减少劣质带钢的产生,本文介绍了一种超声在线辊型检测系统的测试原理,简述了系统的基本构成,提出采用多次反射法和双阀值技术提高精度的方法,具有一定的实用价值。     

一种语音端点检测电路的设计

在基于短时能量和短时过零率的双门限语音端点检测算法基础上,改进其有效语音的判断条件,采用MATLAB工具分析了改进算法的有效性。提出了基于改进算法的语音端点检测电路的设计,该设计减少了实现语音端点检测电路对硬件资源的需求。ModelSim仿真验证表明,改进后的算法有较好的实时性,在采集完一帧语音数据后第4拍给出语音有效信号。最后给出该语音检测电路的FPGA验证平台。     

基于二重势函数法的集群航路规划

人工势场法由于其在构型组织能力上的不足,影响了该方法在集群航路规划上的应用,为此提出基于二重势函数法的集群航路规划法,通过第一重势能场形成集群到目标的可行路径,通过第二重势能场形成构型,从而实现集群航路规划.此外,针对人工势场法存在无谓避碰、陷阱问题等不足,通过引入碰撞危险度来确定障碍物影响距离以及虚拟障碍物,提出改进...